*/
public void registerDocumentHandler( DocumentHandler documentHandler ) throws DocumentTypeAlreadyRegisteredException
{
if(handlers.containsKey(documentHandler.getType()))
{
throw new DocumentTypeAlreadyRegisteredException(documentHandler.getType()+" has already been registered.");
}
// register handler and this with handlers
documentHandler.setHandlerFactory(this);
handlers.put(documentHandler.getType(), documentHandler);